Mournful English member with current account (7)
I believe the answer is:
elegiac
'mournful' is the definition.
(synonym)
'english member with current account' is the wordplay.
'english' becomes 'e' (abbreviation).
'member' becomes 'leg' (I've seen this before**).
'with' means one lot of letters go next to another.
'current' becomes 'i' (symbol for electric current).
'account' becomes 'ac'.
'e'+'leg'+'i'+'ac'='ELEGIAC'
(Other definitions for elegiac that I've seen before include "Poetic, mournful" , "Mournful as in Gray's poem" , "Mournful, lamenting" , "Like classical couplets" , "Plaintive" .)